Bài 1: Cho tam giác ABC vuông tại A có đường cao AH= 24 cm . Biết ab=7, ac=24. Tính BH, CH,AH ? Bài 2 : cho tam giác ABC vuông tại A có đường cao AH = 24 cm. Biết AB:AC= 3:4 . Tính BH, CH Giup mình với !!!

Giúp mình với cả bài này luôn nhé

Cân bằng các phương trình sau: 1. Fe + HNO3 → Fe(NO3)3 + NO + H2O 2. Al + HNO3 → Al(NO3)3 + N2O + H2O 3. Al + H2SO4 → Al2(SO4)3 + SO2 + H2O Giúp mình với đúng cho 5 sao

Bài 1 : Thực hiện phép tính : 99/100 : (1/4 - 1/12 + 1/3) - (-7/5)^2 Bài 2 : Tìm x , y biết a) |x + 1/3|: 3 1/3 - 1 1/5 (hỗn số ) = -3 b) x^2 - 2/3 x = 0 c) (x - 2)(x^2 - 9) = 0 d) 3 ( x - 1/2 ) - 5 (x + 3/10) = 1/2 e) 1/21 + 1/28 + 1/36 + .... + 2/y(y+1) = 2/9

làm hết ạ mn giúp mình vssssssssssssssssssss

1. He (said/ asked/ wondered) us how we would use English in the future. 2. Our children's futures depend (on / in/ to) a good education. 3. It took him a long time (to take / taking/ taken) all of these photos. 4. English is one of the _ (excited /compulsory/delighted) subjects at school. 5. Mai is working very hard for the exam because she wants her parents to be proud (of/ in/ at) her. 6. John last met you in December, 2014, (didn’t John / didn’t he/ wasn’t he)? 7. Local people are pleased (that/ about/ if) the environmental problems have been solved. 8. As John (eats/ has eaten/was eating), he could not answer clearly. 9. Mr. Minh will arrive in Singapore (on/ in/ at) Monday morning. 10. Choose the word whose underlined part is pronounced differently: teach /peace /search. 11. Choose the word whose underlined part is pronounced differently: looked / wondered/stepped. 12. Choose the word which has a different stress pattern: succeed / relax /cover. giúp mình vs ạ nhanh nhanh nha

Complete the story with the past tense of the verbs in brackets. Last Tuesday Peter Kerry, 14,……….. (have) an argument with his father, when Peter ………..(drop) a tin of spaghetti. Later, when the rest of the family………. (go) to a football match, Peter ……………(decide) to run away. He…………. (steal) his father’s passport and credit cards. Then he …………… (catch) the train to Heathrow airport and…………… (book) a flight to Malaysia. The ticket……………. (cost) $499. When Peter’s family………… (come) home, Peter………… (be) already on his way to Kuala Lumpur. Passport officials in London and Kuala Lumpur ………… (not stop) him and he…………… (enter) Malaysia with no problems. From Kuala Lumpur he ………… (travel) on to Johor Baharu. He ………… (try) to check into a hotel, but the receptionist………… (refuse) to accept his credit card. He………… (call) his parents and …………… (tell) them that he……… (be) in Malaysia. Then he………. (leave) Johor Baharu and ……… (get) a lift to Kota Baharu. Here Malaysian police finally………… (find) him. They…………… (take) him back to Kuala Lumpur and ……….. (put) him on a plane to London. His parents………… (feel) very happy, but they………… (be) worried about the future. “This isn’t the first time,” ……. (say) his father. “Last year he…… (run) away to Paris.

giup minh voi aaaa em cam on aaa

giúp mình 10 câu này với bài cuối vote đủ ạ

Chia 14g hh X gồm H2S và H2 làm hai phần Phần 1. Tác dụng với dd NaOH dư.đem dd thu dc đi cô cạn thì thu dc 23,4g muối Phần 2. Đốt hoàn toàn bằng khí Oxi rồi cko sp cháy qua dd Ca(OH)2 dư thấy kl dd giảm 2,9g do với ban đầu và thu dc mg kết tủa Tính phần trăm về kl các chất trong hh X và tinh m